Furnace.



Patented Sept. 22, 1908.

2 SKEETE-SHEET I.

gwuzufot Chianti mi "Quins in!!! no, wulmvamn. l a V xipmmn s'rnirns Specification of Application fi ed. J 3i,

, v M i To all whoziz it may concern:

Be it known that I, AARON Janacltlzen of the United States, residing at Chicago, in

: the county of Cook and State of Illinois, have invented certain new and useful Improvements in Furnaces, of which the following is afull, clear, and exact description, such as will enable t-hoselskilled in the art to which it a pertains to make and use the same.

T is invention relates to improvements in furnaces of that description which are used in heating horizontalx tubular steam-boilers; more particularly it relates to improvements in the furnace shown and described in Patent No. 576,368, granted to me February 2, 1891. In that furnace the movable grate-bars to feeding the fuel into the fire-chamber are mounted on permanent parts of the structure.

In the present invention it is proposed to mount the grate-bars and the mechanism for passage 5 over the bridge-wall.

operating the same upon a movable carriage that can be withdrawn from the fire chamber to permit inspection, cleaning, repairs and for other purposes.

The invention consists in the novel construction, combination and arrangement of parts, such as will be hereinafter fully described, pointed out in the appended claims, and illustrated in the accompanying draw- In the drawings, in which similar reference characters designate corresponding parts, Figure 1 is a longitudinal vertical sectional view of a furnace embodying the invention. Fig. 2 is a view, artly in front elevation and partly in vertiea section of the same.

The horizontal tubular boiler 1 is of the ordinary ty and is mounted in the usual manner in t 1e walls of the furnace above the fire-chamber 2 and the combustion-chamber The two chambers are separated at their lower parts by the bridge-wall I and communicate at their upper parts through the The rear end of the combustiomehamber is connected with the rear ends of the boiler tubes by the flue 6 and the front ends of the tubes open into the flue 7 leading to the uptake.

Above the fire-chamber 2 is the flat arch 8 extending horizontally across the chamber and prrjecting from the upper fixed front wall 9 ot the furnace to the rear of the chamber. The arch is inclined downwardly towards its inner end and it serves to direct the products of combustion from the fire-charm PATENT ()FFICE. AARON JAY, OF cHicao rrLINoIs. v D

F UnNAcn.

Patented Sept- 22, 1908.

her through the passage into the combus tion-chamber 3. The arch is composed of sections 10 held together and supported in. place by the rods 11 passing through them and anchored at their endsin the side walls of the furnace. At the ends of the rods are the plates 12 between which the archsew tions are clamped together. The longitudinal contacting sides of the arch-sections, as at 13, are inclined at a considerable an le from the perpendicular. By reason of tie inclined sides the arch-sections nest closely together and thereby lessen the liability of cracks or openings occurring between the same to permit the escape of the products of combustion from the fire-chamber through the arch. Also by means of the inclined sides any cement or filling placed between the arch-sections will be more firmly held in placle than if the cont-acting sides were vertica In the front part of the fire-chamber 2 is sides 15 and the front 16. The latter orms the movable lower front of the furnace and is provided with the doors 17 to permit access to the ash-pit beneath the grates. The carriage is mounted on the wheels 18 that travel on the tracks 19 laid in the floor of the firechamber. In bearings 20 attached to the outer face of the front 16 of the carriage is journaled the shaft 21 on which are mounted the eccentrics 22 alternately projecting in opposite directions. On these eccentrics are j oumaled the front ends of the grate-bars 23 and held thereon by the bearing-blocks 24. The rear ends of the grate-bars are supported by the hollow box 25 mounted on the rear end of the carriage. Interposed between the box and the ends of the grate-bars are the balls 26 on which the "rate-bars ride when moved. The front ends of the gratebars pass through the opening 27 in the front ism connected therewith is outside of the firechamber. Consequently such mechanism is tree from contact with the fuel. The gratedownwardly so that when they are oscillated by the eccentric mechanism the fuel is fed inwardly. As the eccentrics 22 alternately .pro ect in opposite directions the alternate which will facilitate the movement of the f and the discharge of ashes.

the removable carriage 14 comprisin the of the carriage so that the eccentric mechanrot-ected from the heat and the bearings are bars towards their rear ends are inclined grate-bars will be oppositely oscillatedi Mechanism is provided for rotating the shaft ."21 to oscillate the grate-bars. On the end oft-he shaft is the gear 23 engaging the worm '29 :on the outer end of the shaft 30 journaled in the bracket 31 attached to the front of the carriage. On the inner end of the shaft 30 is the ratchet wheel 3'3 with which engages the pawl 33 carried by the 'arm 34' mounted n11 the lower end of the rod 35. The latter is'connected by the strap 36 with the eccentric 37 on the shaft 38 driven by any suitable source of )ower. When the shaft 38 is rotated the rocl 35 is reciprocated and through the pawl and ratchet mechanism an intermittent rotation is imparted to the shaft 21 to operate the grate-bars. The rod 35 is mounted on the stationary part of the furnace and when the carriage is moved outwardly the pawl 33 disengages the ratchet wheel 32, the construction 0 these two members being such as to permit a ready engagement and disengagement.

In the rear part of the fire-chamber 2 and immediately back of the movable carriage when the latter is in place is the secondary grate 39 to receive the partly consumed and incandescent fuel from the grate-bars 23. The secondary grate is hinged to the-bridgewall 4 directly opposite to the hollow box 25 of the movable carriage. Projecting downwardly from one side of the free end of the secondary grate is the arm 40 to the lower end of which is pivoted the inner end of the rod 41. The outer end of the rod 41 passes throu h the opening 42 in the front 16 of the movable carriage. At the outer end of the rod is the rack 43 to engage the edge of the opening 42. By means of the rod 41 the secondary grate may be agitated or dumped as the occasion requires. The engagement of the rack with the edge of the opening holds the secondary grate in position. By means of the rack the elevation of the secondary grate can be regulated to meet the re uirements. Vhen the carriage is mover the rack is disengaged from the ed e of the opening and the rod passes throu h the opening as the carriage moves outwarc ly.

Then the carriage is in place in the firechamher the up or part of its front wall and the lower part of the fixed front wall 9 form a fuel reservoir above the front ends of the started and the reservoir filled with fuel, the' mechanism for o crating the grate-bars is set in motion. hrough the oscillation of the grate-bars the fuel is gradually fed from the reservoir into the lire-chamber. When the fuel becomes heated and ignition takes place it-gradually moves towards the rear of the fire-chamber. The gases generated by the heat are deflected by the arch over the firc-chamber towards the passage leading into the combustion chamber. The partly consumed and incandescent fuel 1s gradually moved to the rear and deposited in the secondary grate where it is consumed until nothing but the ashes are left. As the gases pass over the secondary "rate they are further heated and are rem y for the further burning that takes place in the combustionchamber. Should 1t become necessary to clear the coals in the secondary grate, this can be easily done by the rod 41. Also by means of this rod the grate can be dumped of its contents. To remove the carriage the rack 43 is disengaged from the edge of the c ening 42 and the rod 41 is released, then 7? t 1e carriage can be readily moved outwardly from the fire-chamber. the pawl and ratchet mechanism can readily separate there will be no obstruction to the moving of the carriage at that oint. "hen the carriage is returned the ro( 411s raised,

access to the same being had by opening the As the members of door 17, to pass through the opening 42 and of said carriage to receive the fuel from the grate-bars, and a rod connected with said secondary grate for operating the same ex tending through and detachable from said carriage so that the latter can be-inoved clear of the rod.

2. In a furnace, the fire-chamber, the combustion-chamber connnunicating with said fire-chamber at their upper parts, a bridgewall separating the lower parts of the fire and combustion-chambers, a removable carriage in the front part of the fire-chamber, a shaft journaled in the forward part of said carriage, means for rotating said shaft, eccentrics on said shaft alternately projecting in opposite directions, inclined grate-bars journaled at their up er ends on said eccentrics, a hollow box on tli e rear art'of said carriage to form a support for the ower ends of said grate-bars,

a, rack on said rod to engage anledge of the frame airs-mid carriage to hold said secondary i0 gratein its adjustments.

In testimony whereof I hereunto afiix my signatme'm the presence of two wltnesses.

AARON JAY.

vies. R. HUTTON, Emmet. B. DURKEE. 

